Cylinder reamer



April 4 1939- J. CAMPBELL 2,152,954

CYLINDER BEAMER Filed Jan. 18, 1957 2 Sheets-Sheet l `April 4, 1939.

J. lL. CAMPBELL CYLINDER BEAMER Filed Jan. 18, 1937 2 Sheets-Sheet 2Patented Apr. 4, 1939 UNITED STATES PATENT OFFICE 12 Claims.

'Ihis invention relates to an improvement in cylinder reamers of thetype commonly used for reaming out the cylinder bores of an engineblock.

In the operation of an internal combustion engine, the walls of thecylinder become worn to some extent in the region of travel of thepistons, but this wear does not extend entirely to the ends of thecylinders because the upper piston rings do not travel that far, whichleaves an internal ridge in each cylinder, which must be removed orreamed out in dressing or reboring the cylinder.

Reamers have been devised heretofore for doing this work, but they havenot been satisfactory because they were ineflicient, complicated inconstruction, expensive to manufacture and other- Wise objectionable.The cost of these reamers has been so great as to almost prohibit thepurchase thereof by the owners of small garages.

The object of this invention is to simplify the construction of a reamerof this character so as to enable it to be manufactured and sold atcomparatively small cost Within the reach of every one having usetherefor, While at the same time increasing the eiciency and operationof the reamer to enable it tol perform its Work effectively andsatisfactorily. Provision is made for adjusting the reamer to fitcylinders of different sizes so that one reamer may be used and adjustedto the sizes of the different cylinders to be reamed out or rebored.'Ihis adjustment may be effected very simply by an adjustment of guiderollers provided for guiding the movement of the reamer in the cylinderand also, if desired, an adjustment of the cutter'.

In carrying out this object, a reamer stock is provided with a pluralityof guide rolls on different sides thereof, at least one set of which ismade adjustable, so that the guide rollers may be adjusted to fitdifferent sized cylinders, and the cutter is also adjustably connectedwith the reamer stock and preferably disposed, so as to be on the sameside thereof, as certain of the rollers, while other rollers are on theopposite side of the reamer stock from the cutter.

A bracket is adjustably connected with the.

upper portion of the stock and carries one or more rollers for varyingand adjusting the position of the reamer with respect to the cylinder.

A preferred embodiment of this invention is set forth in theaccompanying drawings, in which:

Fig. 1 is a vertical sectional View through an engine cylinder showingthe improved reamer in side elevation therein;

Fig. 2 is a horizontal sectional View therethrough on the line 2-2 ofFig. 1;

Fig. 3 is a top plan view of the reamer in place in the cylinder;

' Fig, 4 is a horizontal sectional view there- 5 through on the line4--4 of Fig. l;

Fig. 5 is a similar view on the line 5-5 of Fig. 1;

Fig. 6 is a detail transverse sectional View through the supportingbracket, on the line 6 6, 10 of Fig. 3;

Fig. 7 is a detail edge View of the upper set of guide rolls; and

Fig. 8 is a side elevation, partly in section, of one set of guiderollers and the mounting thereof. 15

An engine cylinder block is designated generally by the numeral I, andhas the usual engine cylinder 2 therein, in which a reciprocating pistonnormally operates. The piston rings usually cause wear ofthe Walls ofthe cylinder 2, during normal operation of the engine, but because theuppermost ring does not reciprocate to the full end; of the cylinder,this wear results in the formation of a slight ridge in the cylinderwhich is designated generally by the numeral 3, and in re-` 25 boringthe cylinder for fitting new pistons or rings to the engine, it isdesirable that this ridge 3 be removed by means of a reamer.

My improved reamer comprises a reamer stock designated generally by thenumeral 4, which is shown in Fig. 1, as having portions 5 vand 6,slightly offset in different directions to receive and mount therespective rollers which guide the turni ing movement of the reamer inthe cylinder.

The stock 4 has a screw stud l, fixed therein in u an end of the offsetportion 5, as shown in Fig. l, which stud projects lengthwise therefromand receives a bracket 8, which is adjusted relative to the stud bymeans of adjusting nuts 9 threaded thereon on opposite sides of thebracket 8. The 40 bracket 8 has downturned arms I0, which receive andmount a wheel II, shaped to revolve on the upper end of the cylinderblock around the engine cylinder and to guide the turning movement ofthe reamer therein. 'Ihe position of the reamer With respect to the endof the cylinder may be varied by adjusting the nuts 9.

CTI

inder as desired and is guided by downturned portions I6 on the edges ofthe bracket 8, as shown particularly in Fig. 6. This provides a freerotary motion of the reamer upon wheels at opposite sides of thecylinder, one of which wheels may be adjusted toward or from thecylinder according to the size thereof and the location of valves orassociate parts of the engine. A

The reamer is provided with a cutter l1 at the upper end of the offsetportion of the stock, which cutter may have straight or tapered edgesaccording to the cylinder to be operated upon. The cutter Il is insertedinto an opening I8 inthe reamer stock against an adjusting screw' I9threaded into the opposite edge thereof and" is locked in place by meansof a set screw 2ll,.as shown in Fig. 4. This enables the cutter I'lto beremoved or replaced as 'desired or adjusted to t different cylinders.

A frame 2l is inserted transverselyin a notch 22 in an edge ofthe oiisetportion 5 of the reamer stock, which frame is secured in place by a studbolt or screw 29, which is inserted through the frame 2l into the reamerstock. Rollers 24 are journaled in `opposite ends-of theframe 2| 'androtate in the cylinder in contact with the walls thereof just beneaththe'cutter il, so as to brace the reamer at or adjacent the point ofcutting.

Immediately'below the rollers E@ on the same side of the cylinder assaidrollers is a frame 25 secured to the offset portion by a lockingscrew EEE. The frame 25 has oiset arms 2l arranged in pairs and in whicharms are journaled four rollers 2S arranged as shown in-Fig 2, to engagea side of the cylinder and to guide the lower end of the reamerv intherotary motion thereof.

On the opposite side of the reamer stock 4 from the sets of rollers 2liand 28, is another set of four rollers' 2Q, journaled in oiset'arms 3i]of a frame 3i. 'The frame Ell is mounted loosely on a bolt 32, one endof `wliich'is threaded into the `offset portion 5 of the reamer stockwith a coil springfinterposed betweena nut 34 on the bolt and one sideofthe iramel, so as to permit yielding motion of the rollers against theside of the cylinder.

On the opposite side of the frame 3| is a wing nut 35 threaded on thebolt 32for adjusting the frame and thel rollers outwardly toward thecylinder wall,'and a cupped spring 36 is interposed between the wing nut35 and the frame `3l to provide `a resilient pressure against'the frame.rihe'bolt32 may be removed and replaced with a long bolt where necessaryin adapting the reamer to a larger sized cylinder. By turning theinutjthe rollers 29 may be adjusted out or back, so as to accommodate forcylinders of different sizes. The frame f3! has a depending lug 3lthereon to which is xed a pin 38 slidably eX- tending into an opening 39in the reamer stock for stabilizing the position of the rollers 29 intheir different adjusted positions.

This reamer issupported by the wheels H and 55 for operation in thecylinder, substantially in the position shown in Fig. 1. In thisposition the rollers y21%,'28 and 29 bear against the sides of thecylinder as shown in Figs. l2 to 5, so as to guide the rotary motion ofthe reamer in cooperation with the wheels. In this position also, thecutter ll bears against the ridge 3 to vbe cut away.

Rotary motion is imparted to the reamer in the usual way by the use vofa wrench or tool connectedwith the upper end of the reamer stock, whichrotary motion causes the cutter to ream -small and large sizes ofadjustment, the wheel I5 may be adjusted as well as the adjustment ofthe wing nut, and if desired an extra length bolt 32 may be substitutedfor the shorter one, "butv ordinarily the one adjustment of the wing nutwill be all that is required for most cylinders from' the smallest tothe largest in normal use.

This reamer provides a secure mounting in the cylinder, an effectiveoperation in removal of the ridge thereof with simple adjustment toaccomrmodate for-different sized cylinders, and the reamer may `loevconstructedat small cost, so as to Ybe `made available `vforpurchase bygarage owners of` smallmeans and ata reasonable cost.

Iclaimz v l.fA cylinder reamer comprising a reamer stock, acutter-carried.thereby,said reamer stock being elongated in `bar shapeand -having a plurality of longitudinally spaced portions laterallyoffset in differentdirectionsrfrom the center axis thereyofapproximately in zigzag shape, and aplurality of-g-uide-rollers attachedrespectively to said ofiset-portionsand carried thereby for guiding theturning `movement of-` thefreamerin. a cylinder.

-v2...A-cylinder yreamer. vcomprising a reamer stock,-.a cutter carriedthereby., said reamer stock being elongated in -barshape and having aplurality of.- longitudinally.spacedv portions laterallyoiisetindifferent. directions. from the center axis thereofyapproximatelywin .,zigzagshape, a plurality o guiderollers attachedrespectively to said oset portions andcarried thereby for guiding theturning-movement of the reamer in a cylinder, and means for adjustingone or more of said rollers radially relative -to the reamer stock. 3. Acylinder. reamer comprising a reamer `stock,acutter.carried thereby, ascrew extend- -ing laterally from the reamer stock and having VAa head:thereon, a f-ramemounted on the screw and carryingv a plurality ofrollers for guidving the turning movement .of the reamer in a cylinder,.a .spring interposed between the frame and head, -a nut threaded ontothe screw o-n the opposite side of theirame from the head for Vadjustingthe. position. of-the frame relative to the screw, and .resilient meansinterposed between said .nut and the frame.

44. Acylinderreamer comprising a reamer stock, a cutter carried thereby,a plurality of roller supports each 'carrying one or 'more rollers and`mounted at different sides of the reamer stock forguidingth'e' turningmovement of the reamer stock, said 'adjustable support having an oisetvlug tl'iereonfanda guide pin connected with said lug andiwith-thereamerstock for holding the adjustablelisupport in .proper relation thereto.

Ihaving.- one-` or' more :.rollers. and secured respectively to thelaterally offset vportions of the reamer stock for guiding the turningmovement of the reamer in a cylinder, at least one of said roller framesbeing on the same side of the reamer stock as the cutter and another ofsaid frame being on the opposite side therefrom, and means for adjustingthe last-mentioned frame radially relative to the reamer stock.

6. A cylinder reamer comprising a reamer stock having an operatingshank, a cutter carried by the reamer stock, said reamer stock having alaterally offset portion at one side of the operating shank, anadjusting screw secured to said oiset portion, a bracket adjustablyattached to said screw and having means thereon for supporting thereamer.

'7. A cylinder reamer comprising a reamer stock having a shank with alaterally offset portion, a cutter carried by the reamer stock, a. screwsecured to the offset portion and extending lengthwise of the reamerstock approximately parallel with the shank, and a bracket adjustablyconnected with the screw and having a roller on one side of the reamerfor supporting the same in a cylinder. i

8. A cylinder reamer comprising a reamer stock having a shank with alaterally offset shoulder portion, a cutter carried by the reamer stock,a screw secured to the offset shoulder portion and extending lengthwiseof the reamer stock beside the shank and approximately paralleltherewith, a bracket adjustably connected with the screw and having aroller on one side of thle reamer for supporting the same in a cylinder,a roller mounting on the opposite side of the reamer from the bracketand slidably connected therewith, and means for securing the mounting tothe bracket in different adjusted positions thereto.

9. A cylinder reamer comprising an elongated bar-shaped reamer stockhaving a portion intermediate the ends thereof bodily offset from themajor portion of said reamer stock providing longitudinally spacedrecesses one within said oset portion and another spaced therefrom,roller supports mounted in said recesses carrying rollers for guidingthe turning movement ,of the reamer, means for adjusting one of saidsupports radially relative to the reamer stock, a cutter carried by thereamer stock, and means for supporting said reamer stock for turningmovement in a cylinder.

10. A cylinder reamer comprising an elongated bar-shaped reamer stockhaving a shank at one end and a portion at the opposite endsubstantially in alignment with the shank with the intermediate portionconnecting said shank and last-mentioned end bodily offset out oflongitudinal alignment with the shank and said end providing a recess onthe axis of the reamer stock, a roller support mounted in said recessand adjustable radially of the reamer stock, a roller support secured tothe end on the opposite side from the recess, a cutter carried by thereamer stock, and means for supporting said reamer stock for turningmovement in a cylinder.

11. A cylinder comprising an elongated barshape reamer stock having ashank at one end and a portion at the opposite end substantially inalignment with the shank with the intermediate portion connecting saidshank and last-mentioned end bodily offset out of longitudinal alignmentwith the shank and said end providing a recess on the axis of the reamerstock, a screw member secured to said offset position and extendingradially in the recess, a roller support mounted on the screw member, anut threaded on the screw member for adjusting said roller supportradially, a roller support secured to the end of the reamer stock on theopposite side from the recess, rollers carried by said roller supports,a cutter carried by the reamer stock, and means for supporting thereamer stock for turning movement in a cylinder.

12. A cylinder reamer comprising an elongated bar-shaped reamer stockhaving a shank at one end and a portion at the opposite endsubstantially in alignment with the shank with the intermediate portionconnecting said shank and last-mentioned end bodily offset out oflongitudinal alignment with the shank and said end providing a recess onthe axis of the reamer stock, a screw member secured to said oisetportion and extending in the recess, a roller support mounted on thescrew member, a nut threaded on the screw member for adjusting saidroller support radially, a roller support secured to the end of thereamer stock on the opposite side from the recess, rollers carried bysaid roller supports, a cutter carried by the reamer stock, a screwsecured to, the offset portion at one side of the shank and extendingapproximately parallel therewith, a bracket mounted on said screw foraxial adjustment lengthwise thereof, and guide rollers carried by thesaid bracket for engaging an end portion of a cylinder structure tosupport the reamer therein.

JOSEPH L. CAMPBELL.

